As I open and work with certain model files, I notice a 'buildup of rotoscopes'... which are easily deleted and pose no real nuiscance... I'm wondering if anyone else gets this oddity in A:M... pertains to no real version- has been happening to me for years.

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I had a problem like this once. It seems to me it was a sort of bug that every time I opened an infected file it duplicated. I'd have to search it out, but I believe I had to go back to the files I'd made and open them in a text editor and delete something. Once I'd gotten them all, everything was fine.

Looking back at the thread, it was an empty rotocontainer tag. I assume on Windows you can do the same, but I searched my drive for files that contained that string. This gave me a list of files to delete the empty container from. Tedious, but it solved the problem. Nancy also describes how it happens, so you can avoid doing that.